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Hell of a writer, that Mr. Hill,
Not so fast. His first hit was written by him, alright. Then the next book was denied by the publisher, it was so badly written. His last hit Think and Grow Rich was co-written by his wife. Of course we don't know just how much help she provided, but again, there was a book before that what didn't get published because just how bad it was, and that was after a hit when publishers publish just about anything to cash on the fame.
The only celebrity Hill bona fide met was Edison, although he kind of tricked him into the meeting, giving him a prize by his publication.